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Neural Regulation

Neural Regulation

Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.

Regulation of Food Intake

Regulation of Food Intake

Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...

Enteric Nervous System: Regulation of GI Motor Activity

Enteric Nervous System: Regulation of GI Motor Activity

The Enteric Nervous System (ENS) plays a pivotal role in regulating gastrointestinal or GI motor activity. This complex network of nerves, deeply embedded within the gut wall, responds to changes in the gut environment and receives input from both the autonomic nervous system and the central nervous system. By doing so, the ENS operates various programs tailored to the body's nutritional status and needs.
During periods of fasting, the ENS initiates the migrating myoelectric complex, a program...

Hormonal Regulation

Hormonal Regulation

Hormones regulate a significant portion of digestion through activation of the neuroendocrine system. The neuroendocrine system of digestion contains many different hormones all with multiple functions that are both, directly and indirectly, involved in digestion.

Gastric Motility

Gastric Motility

Gastric motility is the coordinated contraction and relaxation of stomach muscles that convert ingested food into chyme, a semi-liquid substance ready for further digestion in the intestines. The process begins with the vagus nerve inducing the relaxation of the smooth muscles in the fundus and body of the stomach, allowing these regions to expand and accommodate up to approximately 1.5 liters of food and liquid.
Peristaltic Waves and Chyme Formation
Upon food entry, the stomach initiates...

Regulation of the Digestive System

Regulation of the Digestive System

Digestive activity regulation hinges on three primary components. Activation is prompted by a multitude of mechanical and chemical indicators, primarily detected by receptors within the stomach and intestines' walls. These receptors predominantly respond to factors such as mechanical stretching of the organ walls, changes in pH and osmolarity, and the presence of digesting materials and their by-products.
The effectors in this regulation system are glands and smooth muscles. Activation of these...

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Related Experiment Video

Updated: May 28, 2026

Real-time Analysis of Gut-brain Neural Communication: Cortex wide Calcium Dynamics in Response to Intestinal Glucose Stimulation

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NPF-Driven Gart Expression Fuels Gut Absorption and Modulates Feeding via a Negative Feedback Loop.

Lei He^1,2, Qin Wei^1,2, Yifei Guo^1,2

¹Shanxi Key Lab Nucl Acid Biopesticides, Institute of Applied Biology, Shanxi University, Taiyuan 030006, China.

|May 26, 2026

Summary

Neuropeptide F (NPF) signaling regulates gut absorptive efficiency by controlling GART expression, a key enzyme in purine synthesis. This newly discovered circuit ensures calibrated energy intake by linking nutrient absorption to feeding behavior.

Keywords:

GART trifunctional enzyme Neuropeptide F feeding food absorption

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Real-time Analysis of Gut-brain Neural Communication: Cortex wide Calcium Dynamics in Response to Intestinal Glucose Stimulation

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Gastrointestinal Motility Monitor (GIMM)

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Mechanisms Underlying Gut Hormone Secretion Using the Isolated Perfused Rat Small Intestine

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Published on: February 26, 2019

Area of Science:

Neuroscience
Metabolism
Molecular Biology

Background:

Energy homeostasis relies on integrating brain signals with peripheral nutrient handling.
Neuropeptide F (NPF) and NPY are known central feeding stimulators, but their role in gut nutrient assimilation is unclear.

Purpose of the Study:

To investigate the role of NPF in regulating nutrient assimilation in the gut.
To identify molecular mechanisms linking NPF signaling to gut function and energy balance.

Main Methods:

Utilized *Drosophila* as a model organism.
Investigated the transcriptional circuit between NPF and the GART enzyme.
Employed genetic epistasis experiments to determine the functional relationship between NPF and GART.

Main Results:

Identified a reciprocal regulatory loop where NPF signaling upregulates gut GART expression, enhancing nutrient absorption.
Demonstrated that gut-specific GART is necessary and sufficient for promoting food absorption and consumption.
Showed that peripheral NPF, not brain-derived NPF, is the primary signal in this gut-centered homeostatic module.

Conclusions:

NPF acts as a key regulator of peripheral metabolic efficiency by activating GART to boost nutrient absorption.
Established a novel framework for understanding gut-brain communication in energy balance.
Redefined NPF's role from a behavioral driver to a regulator of nutrient assimilation.